Update dependencies and add .NET SDK version configuration

Updated `xunit.runner.visualstudio` with additional metadata for better asset management. Introduced a `global.json` file to specify .NET SDK version `8.0.0` with roll-forward and prerelease support, ensuring consistent SDK usage across environments.

Author: ivandrofly

Directory.Packages.props

@@ -5,11 +5,14 @@
     <NoWarn>$(NoWarn);NU1507</NoWarn>
   </PropertyGroup>
   <ItemGroup>
-<!--    <PackageVersion Include="Microsoft.CSharp" Version="4.7.0" />-->
+    <!--    <PackageVersion Include="Microsoft.CSharp" Version="4.7.0" />-->
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="MSTest.TestAdapter" Version="3.6.3" />
     <PackageVersion Include="MSTest.TestFramework" Version="3.6.3" />
     <PackageVersion Include="xunit" Version="2.9.2" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.0-pre.49" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.0">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
+    </PackageVersion>
   </ItemGroup>
 </Project>

global.json

@@ -0,0 +1,7 @@
+{
+  "sdk": {
+    "version": "8.0.0",
+    "rollForward": "latestMinor",
+    "allowPrerelease": true
+  }
+}